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Dupré, R. [Author]; Hattawy, M. [Author]; Hafidi, K. [Author]; Paremuzyan, R. [Author]; Pasyuk, E. [Author]; Payette, D. [Author]; Phelps, W. [Author]; Pivnyuk, N. [Author]; Pogorelko, O. [Author]; Poudel, J. [Author]; Prok, Y. [Author]; Ripani, M. [Author]; Ritman, J. [Author]; Jenkins, D. [Author]; Rizzo, A. [Author]; Rosner, G. [Author]; Rossi, P. [Author]; Rowley, J. [Author]; Sabatié, F. [Author]; Salgado, C. [Author]; Schmidt, Anne [Author]; Schumacher, Lennart [Author]; Sergeyeva, V. [Author]; Sharabian, Y. [Author]; [...]

Measurement of deeply virtual Compton scattering off He 4 with the CEBAF Large Acceptance Spectrometer at Jefferson Lab

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  • Media type: E-Article
  • Title: Measurement of deeply virtual Compton scattering off He 4 with the CEBAF Large Acceptance Spectrometer at Jefferson Lab
  • Contributor: Dupré, R. [Author]; Hattawy, M. [Author]; Hafidi, K. [Author]; Paremuzyan, R. [Author]; Pasyuk, E. [Author]; Payette, D. [Author]; Phelps, W. [Author]; Pivnyuk, N. [Author]; Pogorelko, O. [Author]; Poudel, J. [Author]; Prok, Y. [Author]; Ripani, M. [Author]; Ritman, J. [Author]; Jenkins, D. [Author]; Rizzo, A. [Author]; Rosner, G. [Author]; Rossi, P. [Author]; Rowley, J. [Author]; Sabatié, F. [Author]; Salgado, C. [Author]; Schmidt, Anne [Author]; Schumacher, Lennart [Author]; Sergeyeva, V. [Author]; Sharabian, Y. [Author]; [...]
  • imprint: Inst., 2021
  • Published in: Physical review / C 104(2), 025203 (2021). doi:10.1103/PhysRevC.104.025203
  • Language: English
  • DOI: https://doi.org/10.1103/PhysRevC.104.025203
  • ISSN: 2470-0002; 2469-9985; 0556-2813; 1538-4497; 2469-9993; 1089-490X
  • Origination:
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  • Description: We report on the measurement of the beam spin asymmetry in the deeply virtual Compton scattering off He-4 using the CEBAF Large Acceptance Spectrometer (CLAS) at Jefferson Lab using a 6 GeV longitudinally polarized electron beam incident on a pressurized He-4 gaseous target. We detail the method used to ensure the exclusivity of the measured reactions, in particular the upgrade of CLAS with a radial time projection chamber to detect the low-energy recoiling He-4 nuclei and an inner calorimeter to extend the photon detection acceptance at forward angles. Our results confirm the theoretically predicted enhancement of the coherent (e(4)He -> e'4He'gamma') beam spin asymmetries compared to those observed on the free proton, while the incoherent (e(4)He -> e'p'gamma'X') asymmetries exhibit a 30% suppression. From the coherent data, we were able to extract, in a model-independent way, the real and imaginary parts of the only He-4 Compton form factor, H-A, leading the way toward 3D imaging of the partonic structure of nuclei.
  • Access State: Open Access